linux-kernel - Re: [PATCH V33 27/30] lockdown: Print current->comm in restriction messages

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Message-ID: <201906202109.F7662EB8@keescook>
Date:   Thu, 20 Jun 2019 21:09:38 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Matthew Garrett <matthewgarrett@...gle.com>
Cc:     jmorris@...ei.org, linux-security@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        David Howells <dhowells@...hat.com>,
        Matthew Garrett <mjg59@...gle.com>
Subject: Re: [PATCH V33 27/30] lockdown: Print current->comm in restriction
 messages

On Thu, Jun 20, 2019 at 06:19:38PM -0700, Matthew Garrett wrote:
> Print the content of current->comm in messages generated by lockdown to
> indicate a restriction that was hit.  This makes it a bit easier to find
> out what caused the message.
> 
> The message now patterned something like:
> 
>         Lockdown: <comm>: <what> is restricted; see man kernel_lockdown.7
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> Signed-off-by: Matthew Garrett <mjg59@...gle.com>
> ---
>  security/lockdown/lockdown.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
> index 14edc475d75c..408f0048f8a2 100644
> --- a/security/lockdown/lockdown.c
> +++ b/security/lockdown/lockdown.c
> @@ -80,8 +80,8 @@ early_param("lockdown", lockdown_param);
>  static int lockdown_is_locked_down(enum lockdown_reason what)
>  {	
>  	if ((kernel_locked_down >= what) && lockdown_reasons[what])
> -		pr_notice("Lockdown: %s is restricted; see man kernel_lockdown.7\n",
> -			  lockdown_reasons[what]);
> +		pr_notice("Lockdown: %s: %s is restricted; see man kernel_lockdown.7\n",
> +			  current->comm, lockdown_reasons[what]);
>  	return (kernel_locked_down >= what);
>  }

Maybe needs ratelimiting?

>  
> -- 
> 2.22.0.410.gd8fdbe21b5-goog
> 

-- 
Kees Cook